Flavio Corpa kutyel

🌊

数学者に俺は成る！

Functional Engineer 𝝺 Haskell & Elm

kutyel / curry.js

Created July 29, 2016 08:57

Some useful currying examples!

	const get = prop => obj => obj[prop];

	array.map(get('key'));

	const match = req => obj => Object.keys(req).every(key => Object.keys(obj).includes(key) && obj[key] === req[key]);

	array.filter(match({'key': value}));

kutyel / dateDiff.js

Created August 1, 2016 09:20

Diff between dates (in days)

(new Date(2016, 7, 17).getTime() - new Date(2016, 2, 17).getTime()) / 1000 / 3600 / 24

kutyel / fish_greeting.fish

Created August 4, 2016 07:51 — forked from dan-c-underwood/fish_greeting.fish

Custom fish greeting (for fish shell)

	function fish_greeting
	echo ' '(set_color F00)'___
	___======____='(set_color FF7F00)'-'(set_color FF0)'-'(set_color FF7F00)'-='(set_color F00)')
	/T \_'(set_color FF0)'--='(set_color FF7F00)'=='(set_color F00)') '(set_color red)(whoami)'@'(hostname)'
	[ \ '(set_color FF7F00)'('(set_color FF0)'0'(set_color FF7F00)') '(set_color F00)'\~ \_'(set_color FF0)'-='(set_color FF7F00)'='(set_color F00)')'(set_color yellow)' Uptime:'(set_color white)(uptime \| sed 's/.up $[^,]$, .*/\1/')(set_color red)'
	\ / )J'(set_color FF7F00)'~~ \\'(set_color FF0)'-='(set_color F00)') Theme: '(set_color white)(echo $fish_theme)(set_color red)'
	\\\\___/ )JJ'(set_color FF7F00)'~'(set_color FF0)'~~ '(set_color F00)'\) '(set_color yellow)'Version: '(set_color white)(echo $FISH_VERSION)(set_color red)'
	\_____/JJJ'(set_color FF7F00)'~~'(set_color FF0)'~~ '(set_color F00)'\\
	'(set_color FF7F00)'/ '(set_color FF0)'\ '(set_color FF0)', \\'(set_color F00)'J'(set_color

kutyel / slim-redux.js

Created August 4, 2016 08:31 — forked from gaearon/slim-redux.js

Redux without the sanity checks in a single file. Don't use this, use normal Redux. :-)

	function mapValues(obj, fn) {
	return Object.keys(obj).reduce((result, key) => {
	result[key] = fn(obj[key], key);
	return result;
	}, {});
	}

	function pick(obj, fn) {
	return Object.keys(obj).reduce((result, key) => {
	if (fn(obj[key])) {

kutyel / cat.js

Created August 5, 2016 07:30

Outputs a cat to the console!

kutyel / average.js

Created September 20, 2016 17:08

Average of numbers (JavaScript)

averages = n => n ? n.reduce((x,y,i,z) => i < z.length - 1 ? x.concat((y + z[i + 1] || 0) / 2) : x, []) : [];

kutyel / batman.js

Last active November 17, 2016 13:17

https://twitter.com/kentcdodds/status/786597385086480385 Correct refactor!

{ shouldFlag: selectedIds => this.messages.filter(m => selectedIds.includes(m.id)).some(m => !m.flagged) }

kutyel / superman.js

Created October 19, 2016 20:15

	{
	shouldFlag: function(selectedIds) {
	// Assume don't flag
	var shouldFlagMessages = false;
	// Keep track of how many are flagged and not flagged
	var flaggedCount = 0;
	var unFlaggedCount = 0;

	// Get only the messages we care about
	var messagesInQuestion = [];

kutyel / lamda.js

Created October 20, 2016 06:25

	const addNumers = (a, b) => a + b;

	// Takes the values of an array and returns the total. Demonstrates simple
	// recursion.
	const totalForArray = (arr, currentTotal) => {
	currentTotal = addNumers(currentTotal + arr.shift());

	if (arr.length) {
	return totalForArray(currentTotal, arr);
	} else {

kutyel / sortFromArray.js

Last active October 31, 2016 18:35

Order an array given another array with its indices

	const A = ["d", "a", "c", "b"];
	const I = [3, 0, 2, 1];

	A.reduce((x, y, i, arr) => x.concat(arr[I.indexOf(i)]), []);
	// > ["a", "b", "c", "d"]

	// Functional Programming Power!
	const sortExternalFromArray = z => (x, y, i, arr) => x.concat(arr[z.indexOf(i)]);
	// A more elegant/reusable approach
	A.reduce(sortExternalFromArray(I), []);